In this game there will be a grid of 9 x 9 blocks,
this grid is further divided into 9 subgroups of 3 x 3
blocks, in addition to that, the blocks will be
grouped by red clue lines marked with a number. The
object of this game is to fill in all the blocks with
1 - 9 without repeat within either the rows or columns
or the subgroups or the clue groups. Moreover, the
numbers in a clue group must add up to the number
given in the clue. This game is similar to sudoku but
more challenging.

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